test/jdk/sun/security/provider/SecureRandom/DRBGS11n.java

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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import sun.security.provider.DRBG;
import sun.security.provider.MoreDrbgParameters;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;

/**
 * @test
 * @bug 8157308
 * @modules java.base/sun.security.provider:+open
 * @summary Make AbstractDrbg non-Serializable
 * @run main DRBGS11n mech
 * @run main DRBGS11n capability
 */
public class DRBGS11n {

    public static void main(String[] args) throws Exception {

        DRBG d = new DRBG(null);
        Field f = DRBG.class.getDeclaredField("mdp");
        f.setAccessible(true);
        MoreDrbgParameters mdp = (MoreDrbgParameters)f.get(d);

        // Corrupt the mech or capability fields inside DRBG#mdp.
        f = MoreDrbgParameters.class.getDeclaredField(args[0]);
        f.setAccessible(true);
        f.set(mdp, null);

        try {
            revive(d);
        } catch (IllegalArgumentException iae) {
            // Expected
            return;
        }

        throw new Exception("revive should fail");
    }

    static <T> T revive(T in) throws Exception {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        new ObjectOutputStream(bout).writeObject(in);
        return (T) new ObjectInputStream(
                new ByteArrayInputStream(bout.toByteArray())).readObject();
    }
}